If anyone really looks closely at that video clip with the referece line, do you notice anything????
Well, the reference line is located atop the end plates in one shot, and it is not in the next. So although it looks like the center of the wing is deflecting down in the second clip, the whole wing has move in regards to the reference line.
The wing may not even have flexed at all. The camere mount on the other hand is a different story.
Just a close observation
Besides, if Ferrari or anyother team can meet the letter of the regs and design around them and the surface is not movable (by the driver or other mechanical application (computer controled)) then it is not a movable surface. It is just a highly refined aeroelasticly changing surface. It is even rigidly fixed per the reg (solidly mounted). Ferrari isn't the only team that does this, just the most scutinized and videoed.